BATON ROUGE, La. (BRPROUD) -- A Baton Rouge mom convicted of second-degree murder in the overdose death of her young son is set to be sentenced Monday. A judge denied the defense team's request for a new trial on Thursday, Oct. 17. Whitney Ard, 31, was arrested in 2022 after an investigation into her 2-year-old son Mitchell Robinson's death. Arrest documents said a toxicology report showed 14 ng/mL of fentanyl in the child’s blood. Robinson was pronounced dead after being brought to the hospital in June 2022. Investigators learned that he had previously been brought to the hospital two other times in the same year. According to an affidavit, a sibling of Robinson said he “ate mom’s pills.” Ard was arrested and initially charged with negligent homicide. She turned down a plea deal for a charge of manslaughter for a 30-year sentence in April of this year. She was found guilty of murder in September. After Robinson’s death, the Louisiana Department of Children and Family Services changed its policy to increase the priority response level of cases involving children and drugs. Baton Rouge woman sentenced to 20 years in prison after shooting leaves 12-year-old girl dead Latest News 7-year-old crashes one school bus into another during apparent training in Missouri New renderings show how A's ballpark would transform Las Vegas Strip Family Focus: Caregiving expert talks about challenges, importance of having support system Liam Payne's family releases statement as more details emerge in singer's death Mitzi Gaynor, ‘South Pacific’ star, dies at 93